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https://github.com/KolibriOS/kolibrios.git
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138 lines
4.9 KiB
C
138 lines
4.9 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: Implementation of strtok_s() - bounds-checking strtok().
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*
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****************************************************************************/
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#include "variety.h"
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#include "saferlib.h"
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#include "widechar.h"
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#include <string.h>
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#include <wchar.h>
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#include "setbits.h"
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_WCRTLINK CHAR_TYPE *__F_NAME(strtok_s,wcstok_s)( CHAR_TYPE * __restrict s1,
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rsize_t * __restrict s1max, const CHAR_TYPE * __restrict s2,
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CHAR_TYPE ** __restrict ptr )
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/****************************************************************************/
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{
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#ifdef __WIDECHAR__
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const CHAR_TYPE *p2;
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CHAR_TYPE tc2;
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#else
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char vector[32];
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#endif
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char *msg = NULL;
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CHAR_TYPE *p1 = s1;
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CHAR_TYPE *str;
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rsize_t m;
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CHAR_TYPE tc1;
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// Verify runtime-constraints
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// s1max not NULL
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// s2 not NULL
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// ptr not NULL
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// *s1max <= RSIZE_MAX
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// if s1 == NULL then *ptr != NULL
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if( __check_constraint_nullptr_msg( msg, s1max ) &&
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__check_constraint_nullptr_msg( msg, s2 ) &&
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__check_constraint_nullptr_msg( msg, ptr ) &&
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__check_constraint_maxsize_msg( msg, *s1max ) &&
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((s1 != NULL) || __check_constraint_nullptr_msg( msg, *ptr )) ) {
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/* if necessary, continue from where we left off */
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if( s1 == NULL ) {
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p1 = *ptr; /* use previous value */
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}
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#ifndef __WIDECHAR__
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__setbits( vector, s2 );
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#endif
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m = *s1max;
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for( ; tc1 = *p1; ++p1 ) {
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if( ! ((m == 0) ? ( msg = "no start of token found" ), 0 : 1 ) ) {
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break; /* limit reached, quit */
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}
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#ifdef __WIDECHAR__
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for( p2 = s2; tc2 = *p2; p2++ ) {
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if( tc1 == tc2 ) break;
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}
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if( tc2 == NULLCHAR ) break;
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#else
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/* quit if we find any char not in charset */
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if( ( vector[ tc1 >> 3 ] & _Bits[ tc1 & 0x07 ] ) == 0 ) break;
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#endif
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--m;
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}
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if( msg == NULL ) { /* no rt-constraint violated */
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if( tc1 == NULLCHAR ) return( NULL ); /* no (more) tokens */
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} else {
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/* Now call the handler */
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__rtct_fail( __func__, msg, NULL );
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return( NULL );
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}
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str = p1++; /* start of token */
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for( ; tc1 = *p1; p1++ ) {
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if( ! ((m == 0) ? ( msg = "no closing token delimiter found" ), 0 : 1 ) ) {
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break; /* limit reached, quit */
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}
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--m;
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/* skip characters until we reach one in delimiterset */
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#ifdef __WIDECHAR__
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for( p2 = s2; tc2 = *p2; p2++ ) {
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if( tc1 == tc2 ) break;
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}
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if( tc2 != NULLCHAR ) {
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#else
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if( ( vector[ tc1 >> 3 ] & _Bits[ tc1 & 0x07 ] ) != 0 ) {
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#endif
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*p1 = NULLCHAR; /* terminate the token */
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p1++; /* start of next token */
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*ptr = p1;
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*s1max = m;
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return( str );
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}
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}
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}
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if( msg != NULL ) { /* rt-constraint violated */
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/* Now call the handler */
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__rtct_fail( __func__, msg, NULL );
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return( NULL );
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} else {
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*ptr = NULL; /* last token reached */
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*s1max = 0;
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}
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return( str );
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}
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